a(n) = floor(4th elementary symmetric function of Sum_{j=1..k} 1/j, k = 1,2,...,n).

Terms

a(0) =5a(1) =40a(2) =163a(3) =481a(4) =1175a(5) =2512a(6) =4869a(7) =8749a(8) =14801a(9) =23840a(10) =36866a(11) =55077a(12) =79897a(13) =112984a(14) =156254a(15) =211896a(16) =282391a(17) =370528a(18) =479419a(19) =612518a(20) =773638a(21) =966965a(22) =1197074a(23) =1468946a(24) =1787983a(25) =2160025a(26) =2591361a(27) =3088748a(28) =3659424a(29) =4311123